You are worried about your grower pigs. You currently have six pigs around 55kg that you are growing for meat. There are no other pigs on farm. You purchased them around 5 weeks of age and have had no health concerns up until now. All of your pigs have become lethargic, are not eating very much, and appear to be breathing heavily. One pig developed diarrhea yesterday and then died earlier today. You did not notice blood or mucous in the diarrhea.